The idea is not bad

After I heard of such vacuum bags years ago in the TV shopping (or seen ...) had, I wanted to try something well and have the XXXL set ordered. When unpacking, I noticed already that there is no indication for use. So even on the net researching ... So far so good. My test with sheets then went amazingly smoothly. BUT ... After 1 Week was nothing left of the vacuum in the bags left. Say who bag, at which point Anyway, sucked air and shot himself thus sidelined ... self again exhausting the air and again to check the bag did not bring anything. My conclusion: who buys cheap, buys twice. The idea at all I do not like the implementation.